Clamping device of spindle motor including case having inclination surface

Abstract

The clamping device of spindle motor is disclosed, wherein a case portion contacted by the other distal end of the arms is inclined due to depression of a distal end of the arms by the disk, such that the arms linearly moves into the case to allow the other distal end to further rotate upwards, whereby the disk can be easily inserted into the case regardless of size of the inner diameter of the disk.

What is claimed is: 
     
       1. A clamping device of a spindle motor, the device comprising:
 a case rotating with a rotation shaft and configured to be positioned in a central hole of a disk; 
 a plurality of arms; and 
 a plurality of elastic members elastically supporting the plurality of arms, respectively, wherein each elastic member is supported by a support protruder at a lateral inner surface of the case; 
 wherein the case comprises a plurality of inclination surfaces, each at an inner surface of an upper portion of the case and corresponding to each arm, respectively, 
 wherein each inclination surface has a thickness which tapers off in a direction approaching the rotation shaft, and 
 wherein a thickness of each inclination surface, measured at a position farthest away from the rotation shaft, is less than a distance between the inner surface of the upper portion of the case and the support protruder. 
 
     
     
       2. The clamping device of  claim 1 , wherein each arm includes a body, a guide rail formed on the body, and a disengagement prevention rail formed at a side of the body, wherein a distal end of the body is positioned at a lateral outer side of the case to contact the central hole of the disk, and wherein another distal end of the body is positioned at a lateral inner side of the case for rotative and linear movement whereby the disk is inhibited from being disengaged from the case. 
     
     
       3. The clamping device of  claim 1 , wherein the inclination surface is formed as a flat surface. 
     
     
       4. The clamping device of  claim 1 , wherein the inclination surface is curved as concave or convex.